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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7610e54566ece644e864288216209714729b7a967553fa463cb6726033b309f' 
  AND token = 'lcFpBDuaY1s76WX8tvk+6SInHCo4MpTlsloPebei2Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}